Thread guide



Mar. 13, 1923. 1,448,076l

J. R. MITCHELL 4 THREAD GUIDE Filed Sept. l, 1922 @LW/@Zia f M tively widev at the end where the thread enters and is on a curve in substantially the arc of a circle from that edge to a line 22 slightly beyond aver-tical .plane y.through the point of the YV-'shaped 4depression l2 in the 'base of member l0 and from that line the portion 23 extends at an angle downwardly to the .end 'portion 24 between the outer edges of walls 18 and 19 which -curves downwardly l on an arcVv of small radius.v The bottom of the slot at its highest portion where the thread Q5 rests Ais preferably about a quarter of an inch* wide and its discharge end at isso7much 'lower that the thread' in norm'al'usedoes not'make contact with iti 'i In prior threadrguides of this general type' the arrangement of'partsh'as been such that most of the travel of t'he'thread was' at vthebottoni of the' narrow portion ofthe slot with very little chance for movement 'up and down "in the'slotrand thus the wear due to the friction of" the thread`=was localized and v the 'varying lateralf'an'gles fat' which the of the" narrow lportion' at itsbot'tom as ,tol

thread leaves'the narrow `slotcaused'such friction and wear'continually on the sides soon wear away'thematerial and in eifect nso enlarge the guide slot that it "ceased to deliver the thread withthat accuracy in satisfactory' work and the. guide asa wholeV had to be discarded and a new' one substituted.

In thegui'de" constituting thepresent invention the thread hasfree up and down'- movement in" the narrow delivery slot and thus the side wear is" so distributed longitudinally of thev slot astoprolong its'ef- The width of the bottom supporting surface over which the thread moves laterally in addition to itslongitudinal movement andthe roundedl form' of that surface'sol distribute the wear as to permitvprolonged userbefore 'it becomes noticeable.

Although'a spe'ciiic'embodiinent'of the infor purposes of "illustraf vention is shown tion,V it will beunderst'ood thatit `is not 'limited to'that specific form beyond what is-I indicated in the following claims.

Haying thus 'described the invention 'what-f 1s claimed asnew4 and desired to be secured 1 by "Letters Patent'is':

LAS an article of manufacture a' thread 1 guidefcdnsisting of "a continuous block-hav- 'ing l`a transverse "guide "slot with vertical sidesv tapering from the entrance side to the discharge side `terniinating Yclose together-v forminga narrw 'discharg'ef'portion the central portion ofthe bottom 'of said yslot in the line of movement' 'being'mater'i'ally abovethe: portionu at the discharge end.

' 2: AsA an yarticley of rmanufacture -a thread guide consisting of aA continuous block 'hav-A ing#actransversey guidef slotA ywitl'i I:vertical sides tapering from the entrance side to the Acentral plane 'of said block discharge side terminating close together having a narrow discharge portion the bottom of said slot from the leading edge being. curved upwardly to the central vertical plane of the blockand from that point onto the discharge end being inclined downwardly at such angle that the thread beingy deliveredwill not bear on it at or near the narrow discharge portion ofthe slot.

3. As an article of vmanufacturea thread guide consisting of a continuous block having la transverse guide slot therein terminatingat thedischarge end as a narrowslot in a surface of said block slightly inclined toa vertical-plane and extending vertically from the top of said block nearly to thefbottom plane thereof, the bottom of said guide slot from said'discharge end inwardly being inclined upwardly for morel than half its` the central point on'the line of movement of the thread which is wide enough to support and permit material lateral movement of the thread distributing wear and which is high enough above the discharge end of the bottom of the slot that the thread may move up anddown in the narrow slot of the guide y distributing the lateral wear due to friction.

5. A thread guide consisting of a symrmetrical and continuous blockhaving a central lateral projection on the discharge side extending from its upper edge to its lower edge and having a transverse guide vslot i which extends Vthrough-said lateral' exten- 'sion forming a vertical narrow discharge end of theguide'slot and bringing it materially nearer to' the article receiving the thread than is done with the usual continuous guide blocks heretofore used;y

f i6; `A hread guide consisting of a continuous block having a transverseguide slot with a bottom wall vportion in advance of the longitudinal center of said slot for supporting the thread being delivered vthesaid f portion havin@ width substantially as 'great as one-fourth' inch and said slot terminating a material distance from the vertical on thedischarge side 'between' two vertical wall surfaces close'together forming an elongated vertical delivery slot in which the thread may move vertically aswell as longitudinally.

`-7. A' thread guide consisting of a `symmetrical and continuous block having a central-lateral Yprojection on the discharge side extending-from its lupper edge te its lower 'edge' and 'having-a transverse. guideslot which extends through Seid lfffi @Merisi-0n lill@ forming a Vertical narrow discharge end of the guide slot, the side Walls of said slot being inchned towards each other from its receiving end approximately to its discharge 5 end and the bottom Wall of the slot being on substantially the arc of a circle from the, leading edge to 'and slightly beyond th e longitudinal center plane of the block and the bottom from that point on to the discharge end being at e sharp incline downward.

In testimony 'whereof I hereunto aiiiX my signature.

JOHN R. MITCHELL. 

